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Pro Moto Billet Exhaust Cap Wash Plug — image 1
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Pro Moto Billet Exhaust Cap Wash Plug

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A plug to keep water from getting into a muffler through a ~1.5625″/40mm ID PMB/Fastway Cap

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Model information

Category
Automotive
License
Creative Commons — Attribution — Noncommercial — Share Alike

Designed for the large Pro Moto Billet Exhaust Cap with ~1.5625″/40mm ID (fits KTM/Husky 350/501, maybe some other bikes too), since I didn't feel like paying $30 for their billet aluminum plug.

Fits a 32 x 4 mm o-ring, like this: uxcell Nitrile Rubber O-Rings 40mm OD 32mm ID 4mm Width, Metric Sealing Gasket for Automotive Machine Plumbing, Pack of 10. 

Should fit quite snugly, so it may be used for transportation & storage in a rain. A piece of paracord, or a rope, or simply a zip tie can be threaded through the holes and used to pull the plug out.

Printed in PETG with the wider side down.
I recommend adding paint on supports on the o-ring slot upper side (see the screenshots) and a random seam alignment.
 

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